Die for forming carriage-lamp linings



(No Model.)

, F. c. CANNON. 4 DIE FOR FORMING CARRIAGE LAMP LININGS, No. 457,557. IPatented Aug. 11,- 1891.

3 ,4 3 I "f r" NITED STATES PATENT CFFICE.

FREDERICK C. CANNON, OF NEIV HAVEN, CONNECTICUT.

DIE FOR FORMING CARRIAGE-LAMP LlNlNGS.

SPECIFICATION forming part of Letters Patent No. 457,557, dated August11, 1891.

Application filed March 2 1891. Serial No. 383,455. (No model.)

To all whom it may concern.-

Beit known that I, FREDERICK C. CANNON, of New Haven, in the county ofNew Haven and State of Connecticut, have invented a new Improvement inDies for Forming Carriage- Lamp Linings; and I do hereby declare thefollowing, when taken in connection with accompanying drawings and theletters of reference marked thereon, to be a full, clear, and exactdescription of the same, and which said drawings constitute part of thisspecification, and represent, in

Figure 1, a face view of the die; Fig. 2, a transverse section on linemxof Fig. 1; Fig. 3, an end view of the elastic block. Fig. 4, atransverse section illustrating the operation.

7 Fig. 5, a face View of the lining; Fig. 6, a

transverse section of the same on line as a: of Fig. 5; Fig. 7, atransverse section showing modification in the shape of the lining; Fig.8, a modification.

This invention relates to an improvement in dies for shaping that classof carriage-lamp linings in' which the central portion presents aconcave or convex surface, as the case may be, the surrounding portionforming a body which in some cases is itself made of convex or con caveshape in transverse section and in other cases is made plain. Thecentral surface and the border come together so as to form a definedline between the central portion and the border. One of these linings isrepresented in Figs. 5 and 6, Fig. 5 being a front or face View, andFig. 6 a transverse section. In this illustration the central or convexportion A is represented as in the form of a parallellogram with theangles rounded. The said central portion A presents a convex surfaceoutside, as seen in Fig. 6, and the border B is also of similar convexsurface. The two convex surfaces coming together, as before stated,produce a line at around the central portion between it and the border.This line is clearly defined. The convexity is slight, but yet enough toproduce an apparent convex surface. The lining may be produced so thatthe reverse or concave sidc may be the out-- side, if desired. In somelamps the whole surface of the lining is made convex or concave.Heretofore these linings have been shaped by hand, working the metalfrom the top by means of burnishing -tools, it being impracticable tostrike or shape the lining by dies such as usually employed in thestriking up of sheet metals, for the reasonthat the sheet-metal blankfrom which the lining is to be made is first electroplated andburnished, and the employment of metal dies for striking up such metalwould injure the polished surface.-

The object of my invention is the construction of dies by which liningsmay be readily and perfectly shaped; and the invention consists in a dieconstructed as hereinafter described, and particularly recited in theclaims.

'I will first describe the invention as for making a lining having acenterA and a border B, so as to present a convex surface outward, andsuch as shown in Figs. 5 and 6.

The die consists of aplate or body C, on the face of which is a rib D,in shape corresponding to the defined line required between the borderand central portion of the lining. The edge of this rib is made quitesharp and projects from the body C so far as to form a space E ofconsiderably greater depth than the extent of convexity required for thelining. Outside the rib -D is another rib F, surrounding the rib D,distant therefrom somewhat less than the width of the border. Its edgeshould present substantially a flat surface, and it is in a plane withrelation to the rib D corresponding to the position required for theedge of the platein relation to the line between the border and thecenter.

In Fig. 2 the die is represented as having the rib F in the same planewith the edge of the rib :D. This completes the die proper.

The companion to the die 0 is an elastic block G, preferably ofindia-rubber, and is of a size as large or larger than the die, andpreferably presents a fiat surface toward the die. In operation theblank H for the lining is made from sheet metal, such as usuallyemployedin the manufacture of lamp-linings, and islaid upon the elastic block G,beneath the die 0, as seen in Fig. 4. The die is carried by any oftheusual mechanisms for operating such dies, preferably a press. Theblank is placed in proper relation to the die C,.and then the die C isbrought down onto the blank, as seen in broken lines, Fig. 4, the rib Fstriking the blank near the edge, so as to press it hard upon theblockG. The rib D also strikes upon the surface of the metal, and the ribsare forced upon the metal. The elastic block G, giving way under theribs, as represented in broken lines, the metal between the ribs and theelastic block is forced into the block, while the metal between theribs,

having no force applied thereto, will be thrown up between the ribs bythe elasticity or non-yielding of the elastic block, and so that thesharply-defined line a, surrounding the border, will be produced in theblank, the edges held by the rib F, so as to prevent the metal curling,and the metal will be thrown up within the said line into convex shapewithin the rib D, and the metal between the rib D and the rib F will inlike manner be thrown up into convex shape, as seen in Fig.

6, and so as to produce a convex border.

It will be understood that the shape of the ribs is made correspondingto the shape required for the lining. The shape represented will besufiicient to enable others skilled in the art to adapt the invention tovarious shapes required.

If it be desired to make the border in a plane somewhat diiferent fromthat of the center O-as, for illustration, as seen in Fig. 7, in whichthe border is represented as thrown back or below the plane of thecentert-he ribs are arranged in corresponding planes, but always so thatthe outside rib F may come to a bearing upon the border portion, so asto prevent its curling. The convex surface thus produced is the outer orexposed surface of the lining, and which surface is plated and burnishedbefore the shaping operation is produced, such shaping operation in noway injuring that surface, for the reason that the surface, except onthe line defining the two parts, does not come in contact with metal.

In case the concave surface is desired for the outside, then the blankwill be, reversed, and that which is to be the outside will lie upon theblock.

In case the surface of the lining is to be made convex or concavethroughout, then the rib D is dispensed with, as seen in Fig. 8, theouter rib being adapted to strike the surface, as before, and whenbrought upon the blank lying on the block the block and blank will becompressed, as indicated in broken lines, Fi 8.

From the foregoing it will be understood that the blank is placed uponthe elastic block with that side which is required to be concave nextthe block, so that the block may operate to force the metal up insidethe space within the rib.

It .will be understood that the center of the blank may be previouslystruck, spun, or otherwise formed in any desired shape, and then theremaining surfaces formed either convex or concave, as before described.

I claim- 1. The herein-described die for producing concavo-convex-shapedcarriage-lam p linings, consisting of the body constructed with a ribupon its face, the outline of said rib corresponding to the outline ofthe concavo-convex shape to be produced, and so as to leave a space uponthe face of the block within the said rib, combined with an elasticcompanion block, substantially as described.

2. A die for shaping carriage-lamp linings, consisting of the body 0,constructed with the ribs D and F upon its face, the rib D within thesaid rib F, and so as to form clear spaces on the face of the die withinthe rib D and between the said ribs D. and F, combined with the elasticblock G, substantially as and for the purpose described.

In testimony whereof I have. signed this specification in the presenceof two subscribing witnesses.

FREDERICK O. CANNON.

\Vitnesses:

FRED O. EARLE, LILLIAN D. KELSEY.

